Micrometer-caliper.



F. SPALDING.

MICROMETEB. GALIPER.

APPLICATION FILED JUNE 24, 1912.

1,095,745. Patented May 5, 1914.

COLUMBIA PLANOGRAPH co.. WASHINGTON. D. c.

UNITED STATES PATENT @FFTQE.

FRANK SPALDING, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO BRQVVN 62: SHARCPE MANUFACTURING COMPANY, 6F PROVIDENCE, RHOIDE ISLAND, A CORPORATION OF RHODE ISLAND.

MIGROMETER-CALIPER.

Specification of Letters Patent.

Patented May 5, 1914.

To all whom it may concern:

Be it known that I, FRANK SPALDING, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Micrometer- Calipers, of which the following is a specification.

This invention relates to certain new and useful improvements in micrometer calipers, and is an improvement on Letters Patent granted to me on August 22, 1911, No. 1,001,471.

The primary object of the present invention is to provide means whereby the cylinder graduations are progressively covered and but one of same is exposed at a time, to absolutely prevent mistake in reading inuse of the instrument.

The invention aims to provide a micrometer caliper of simplified and improved construction in which the number of parts employed are reduced to a minimum, and to otherwise generally improve the structure.

In the drawings: Figure 1 is a side elevation. Fig. 2 is an enlarged sectional view. Fig. 3 is a side elevation partly broken away and in section of the index barrel. Fig. 4c is an end elevation of Fig. 3. Fig. 5 is a side elevation of the longitudinally movable sleeve. Fig. 6 is an end elevation of Fig.5, and Fig. 7 is a plan view of one of the looking bars. I

The U-shaped yoke member 1 of the calipers has the usual anvil 2 on one arm and has its other arm formed with a hollow cylinder 3. The cylinder 3 is provided with a longitudinal row of numbers as shown in Figs. 1 and 2 of the drawings. Cylinder 3 is internally threaded to engage with a reduced extension 1 carried by an exterior-1y threaded spindle 5. The rear end of spindle 5 is provided with a threaded portion 6 to receive a knurled nut 7 that abuts a head 8 carried on the rear end of the spindle. Lock nuts 9 abut the head 8 and are mounted on the rear end of spindle 5 as described in my above mentioned patent. An annulus 10 is rotatably mounted on spindle 5 and is formed with a cam surface 11 that engages with the rear end of a barrel 12 mounted on the spindle 5. Barrel 12 is formed with a cam groove 13 and its periphery is provided with a row of numbers as shown in Fig. 2.

an outwardly spring pressed pin lat is carried by the barrel 12, the free end of the pin being for engagement in one of a series of depressions 15 that are formed in the end of an index barrel 16. The index barrel is formed with a peripheral series of notches 17 that are adapted to receive an inwardly proecting protuberance 18 that is formed on one end of a locking bar 19, the locking bar having a similar projecting protuberance 20 that extends in the cam groove 13 of the barrel 12. The index barrel 16 is provided with a collar 21 which has a row of numbers peripherally arranged thereon, the front end of the barrel being provided with a pair of diagonal slots 22 that are adapted to register with the longitudinal row of numbers on the cylinder 3 and are of a width to expose but one of said numbers at'a time. A sleeve 23 which-is movable longitudinally on the cylinder 3 is mounted on the index barrel 16 and its outer end is engaged with a tapered flange 2 1 which has peripheral graduations 25 thereon as depicted in Fig. l, which graduations are adapted to coincide with the Zero or base mark 26 on the sleeve 23. The sleeve 23.is provided with. an opening 27 that is ings 28 and 29 that are adapted to expose the.

peripheral rows of numbers on the collar 21 of barrel l6, and barrel 12, respectively. In order to prevent rotation of the sleeve 23 relative to the cylinder 3, the latter is provided with longitudinal slots 30 that receive pins 31 carried by the sleeve 23 as depicted in Fig. 6 of the drawings.

The operation of the device is'as follows: The head 8 rotated about the sleeve 23 carries with it the spindle 5 and consequently index barrel 12, the thousandth part of an inch being read on the head. The next numeral appearing aiterthe first thousandth will appear in the opening 29 over barrel 12, registering the nearest thousandth. As the barrel 12 progresses and finally carries in its action the index barrel 16, the latter will register the hundredth parts through opening 28 of sleeve 23 and similarly the tenth parts of an inch are read through the open ings 22 and 27 on the row of numbers borne by the cylinder 3'.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a micrometer caliper, in combination with a cylinder having a roW of numbers thereon, a spindle connected to the cylinder, an index barrel surrounding the cylinder and having a. pair of diagonal slots for registry with the row of numbers, said barrel llttv'lllg a peripheral series of numbers thereon, a barrel on the spindle having a peripheral series of numbers thereon, and a sleeve that incloses the index barrel and said second named barrel and having openings to register with the diagonal slots of the index barrel and with the row of numbers on said index barrel and the row of numbers on the second named barrel.

2. In combination with the cylinder of a micrometer calipers yoke, which cylinder is longitudinally graduated, a spindle connected to the cylinder, indicating means in operative connection with the spindle for registering the micrometer measurements including a member rotatably mounted over the cylinder and having a slot to expose but one of the graduations thereof at a time through said means.

3. In combination with the cylinder of a micrometer calipers yoke, which cylinder is longitudinally graduated, a spindle connect-- ed to the cylinder, indicating means in 03erative connection with the cylinder for re istering the micrometer measurements including a member mounted over the cylinder and having a pair of diagonal slots to progressively cover and expose the graduations thereof.

4;. In combination With a cylinder of a micrometer calipers yoke, which cylinder is longitudinally graduated, indicating means in operative connection with the cylinder for registering the micrometer measurements including a rotatable member formed to pro gressively cover the graduations on the cylinder and to expose but one of the graduations at a time through said means.

In combination with the graduated cylinder of a micrometer ealipers yoke, means movably connected to the cylinder for registering the micrometer measurements having an aperture through which said graduations are displayed, and means which cooperate with and are movable relative to and actuated by the first named means for progressively covering said graduations and exposing but one of the graduations at a time through said aperture.

6. In combination with the graduated cylinder of a micrometer calipers yoke, means movably connected to the cylinder for registering the micrometer measurements having an aperture for displaying said graduations, said means including a device movable relative to the aperture for allowing but one graduation to be displayed through said aperture until the movement of said means between two of said graduations has been accomplished.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRANK SPALDING. lVitnesses Ana E. Haenn'rv, J. A. MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

